PhyMod: Delete Query Available

A version of PhyMod that can do a delete query is now available from the project SVN. I ended up using the nested set values after tinkering with the transitive closure data. I will probably recode the SQL in these to avoid using nested SQL. The delete query is simply a cut at the command line where a paste is not indicated. The code will count the number of records that will be deleted from the tables and warns the user before wreaking havoc.